THE CANADIAN ENTOMOLOGIST. 125 



reaching the third posterior cell, and also by the fact that the crossband 

 of light coloured tomentum on the fourth segment of the abdomen is 

 always broadly interrupted in the middle. 



Exoprosopa iota, O. S. — Originally described from Mexico. I have 

 specimens which I collected in Los Angeles county, California. It is 

 almost certain that this is simply a form of dor is in which the first 

 posterior cell is closed and petiolate. In the Canadian Entomologist for 

 January, 1887, pages 12 and 13, I called attention to the variability of 

 this character in specimens of doris captured at the same time and place, 

 stating that in view of this fact Rondani's proposed genus Argyrospila 

 must be rejected — an opinion previously expressed by the learned 

 Austrian Dipterist, Dr. Schiner, but which fact I was not aware of at the 

 time of writing the article above mentioned. 



Gero7i, Meigen. — Up to the present time but a single species belonging 

 to this genus has been reported from the region west of Texas ; this is 

 aibidipennis, Loew., which is not rare in Southern California. My collec- 

 tion contains two other as yet undescribed species from this State, both 

 of which will be readily distinguished from the above species by the form 

 of the third antennal joint. In the latter this joint when viewed from the 

 side is seen to taper very gradually to the tip, the outline being narrowly 

 lanceolate, about six times as long as broad. The other two species may 

 be characterized as follows : — 



Geron fasciola, n, sp. — Head black, front and face silvery white 

 poUinose in the ,$ , light grey in the 9 > very short, sparse white pilose ; 

 first joint of antennae one and a fourth times as long as the second, the 

 third joint one and a-half times as long as the first two, in profile scarcely 

 more than twice as long as broad, tapering slightly to the apex, which is 

 obliquely truncated and bears a small tubercle which extends obliquely 

 upward ; proboscis, excluding the labellae, one and a-fourth times as long 

 as the head, tip of palpi reaching its middle, occiput light grey pollinose, 

 and sparse white pilose. Thorax black, the margins light gray pollinose, 

 that in middle of dorsum brown, continued in two median lines an- 

 teriorly ; very short sparse white pilose ; pleura, coxte and scutellum light 

 gray pollinose and sparse white pilose. Abdomen black, hind margin of 

 each segment white, most extended on the first segment ; entire dorsum 

 light gray pollinose and sparse white pilose ; venter white, sparse white 

 pilose. Legs black, light gray pollinose, apex of each femur narrowly, 

 basal half or more of each tibia, and base of each metatarsus, yellow, the 



